BRASSICACEAE. 



131 



petals, or wanting. Androecinm of 6 stamens with 1 pair shorter than 

 the others, or rarely of 2 or 4 stamens. Gynoeeium of 2 united carpels. 

 Stigma depressed or 2-lobed. Fruit capsular, elongate (siliqne) or short 

 (silicle), flat, terete or angled. 



Pods flattened or compressed contrary to the narrow partition. 



Pods cuneate, wingless. 1. Bdksa. 



Pods scale-like, winged or margined, at least at the apex. 



Seeds solitary in each cavity of the pod. 2. Lepidium. 



Seeds several in each cavity of the pod. 3. Thlaspi. 



Pods neither compressed nor flattened contrary to the partition, 

 terete or prismatic, or flattened or compressed parallel to 

 the partition. 

 Pods terete or prismatic. 

 Pods regularly dehiscent. 



Length of pod less than twice the width. 



Seeds flat : plants pubescent with mostly branched 



hairs. 4. Camelina. 



Seeds turgid : plants pubescent with simple hairs or 

 glabrous. 

 Corolla yellow : plants perennial by rootstocks. 5. Radicula. 

 Corolla white : plants perennial by long pungent 



roots. 6. Armoeacia. 



Length of pod over twice the width. 



Pods merely tipped by the short style or style want- 

 ing, not beaked. 

 Pods terete or nearly so. 



Seeds in 2 rows in each cavity of the pod. 

 Corolla yellow : leaf-blades toothed or 



pinnatifid. 5. Radicula. 



Corolla white : leaf-blades pinnately 



divided. 7. Sisymbrium. 



Seeds in 1 row in each cavity of the pod. 

 Leaf-blades pinnatifid or coarsely toothed. 

 Anthers ovoid : pods slender and taper- 

 ing to the apex, appressed to the 

 rachis. 8. Erysimum. 



Anthers oblong-sagittate : pods very 

 slender hut not tapering, to the 

 apex, widely spreading. 9. Norta. 



Leaf-blades entire or slightly toothed. 10. Hesperis. 

 Pods 4-sided or 4-angled. 



Corolla white. 11. Arabidopsis. 



Corolla yellow. 



Seeds flat : leaf-blades pinnatifid. 12. Barbarea. 



Seeds plump : leaf-blades entire or toothed. 13. Cheirinia. 

 Pods markedly beaked. 



Pod-beak conic, terete, the pod-body relatively 



long. 14. Beassica. 



Pod-beak flat, 2-edged, the pod-body relatively 

 short. 

 Pod-valves 3-nerved ; beak long. 15. Sinapis. 



Pod-valves 1-nerved ; beak short. 16. Eruca. 



Pods indehiscent. 17. Raphanus. 



Pods fiattened or compressed parallel to the broad partition 

 Pods suborbicular or ovoid. 



Corolla yellow : sepals persistent : pods broad above 



and notched. 18. Altssum. 



Corolla white : sepals deciduous : pods narrowed above, 



not notched. 19. Koniga. 



Pods oblong to narrowly linear. 

 Valves of the pods nerveless. 



Seeds in 2 rows in each cavity. 20. Deaba. 



Seeds in 1 row in each cavity. 



Caulescent plants with alternate leaves : embryo 



with equal cotyledons. 21. Cardaminb. 



Scapose plants with 2-4 leaf-like bracts subtend- 

 ing the peduncle : embryo with unequal coty- 

 ledons. 22. Dentaria. 

 Valves of the pods nerved. 



Pods oval, oblong, or broadly linear. 20. Draba. 



Pods narrowly linear to linear-filiform. 23. Aeabis. 



